<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul v-for="cart in cartInfoList" :key="cart.id" class="cart-list">
          <li class="cart-list-con1">
            <input :checked="cart.isChecked==1" name="chk_list" type="checkbox" @change="updateChecked(cart, $event)">
          </li>
          <li class="cart-list-con2">
            <img :src="cart.imgUrl">
            <div class="item-msg">{{ cart.skuName }}</div>
          </li>

          <li class="cart-list-con4">
            <span class="price">{{ cart.skuPrice }}</span>
          </li>
          <li class="cart-list-con5">
            <a class="mins" href="javascript:void(0)" @click="handler('minus',-1, cart)">-</a>
            <input :value="cart.skuNum" autocomplete="off" class="itxt" minnum="1" type="text"
                   @click="handler('change', $event.target.value*1, cart)">
            <a class="plus" href="javascript:void(0)" @click="handler('add', 1, cart)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ cart.skuNum * cart.skuPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <a class="sindelet" @click="deleteCartById(cart)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input :checked="isAllCheck&&cartInfoList.length>0" class="chooseAll" type="checkbox" @change="updateAllCartChecked" />
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteAllCheckedCart">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>0</span>件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ totalPrice }}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import {mapGetters} from 'vuex'
import throttle from "lodash/throttle";

export default {
  name: 'ShopCart',
  mounted() {
    this.getData()
  },
  methods: {
    //获取个人购物车数据
    getData() {
      this.$store.dispatch('getCartList')
    },
    //修改某一个产品的个数[节流]
     handler:throttle(async function(type, disNum, cart){
      //type: 为了区分这三个元素
      //disNum形参: +变化量(1)  -变化量（-1） input 最终的个数（并不是变化量）
      //cart:哪一个产品【身上有ID】
      //向服务器发请求, 修改数量
      switch (type) {
          //加号
        case "add":
          //带给服务器变化量
          disNum = 1
          break;
        case "minus":
          //判断产品个数大于1，才可以传递服务器-1
          disNum = cart.skuNum > 1 ? -1 : 0
          break;
        case "change":
          //用户输入进来的最终量， 非法的(带有汉字|出现负数)，带给服务器数字零
          if (isNaN(disNum) || disNum < 1) {
            disNum = 0
          } else {
            //属于正常情况（小数：取整），带给服务器变化的量 用户输入进来的 - 用户起始个数
            disNum = parseInt(disNum) - cart.skuNum
          }
          break;

      }
      try {
        await this.$store.dispatch("addShopUpdateShopCart", {skuId: cart.skuId, skuNum: disNum})
        this.getData()
      } catch (error) {
        alert(error.message)
      }
    }, 500),
    //删除某一个产品的操作
    async deleteCartById(cart) {
      try {
        //如果删除成功再次发送请求获取购物篮中的数据
        await this.$store.dispatch("deleteCartListBySkuId", cart.skuId)
        this.getData()
      } catch (error) {
        alert(error.message)
      }
    },
    //修改某个产品的勾选状态
    async updateChecked(cart, event){
      //如果修改数据成功，再次获取服务器数据(购物车)
      try {
        let isChecked = event.target.checked ? "1" : "0"
        await this.$store.dispatch("updateCheckedById", {skuId: cart.skuId, isChecked})
        this.getData()
      }catch (error){
        alert(error.message)
      }
    },
    //删除全部选中的商品
    //这个回调函数没办法收集到一些有用的数据
    async deleteAllCheckedCart(){
      try {
        //派发一个action
        await this.$store.dispatch("deleteAllCheckedCart")
        //再次发送请求获取购物车列表
        this.getData()
      }catch (error) {
        alert(error.message)
      }
    },
    //修改全选按钮
    async updateAllCartChecked(event){
      try{
        let isChecked = event.target.checked ? "1" : "0"
        //派发action
        await this.$store.dispatch("updateAllCartChecked", isChecked)
        this.getData()
        } catch (error) {
        alert(error.message)
      }
    },
  },
  computed: {
    ...mapGetters(['cartList']),
    //购物车数据
    cartInfoList() {
      return this.cartList.cartInfoList || []
    }
    ,
    //计算购买产品的总价
    totalPrice() {
      let sum = 0
      this.cartInfoList.forEach(item => {
        sum += item.skuNum * item.skuPrice
      })
      return sum
    }
    ,
    //判断底部复选框是否勾选[全部产品都选中，采勾选]
    isAllCheck() {
      //遍历数组元素，只要全部元素isChecked为真，才为1
      return this.cartInfoList.every(item => item.isChecked == 1)
    }
  }
}
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;

      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }


        .cart-list-con4 {
          width: 10%;

        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>

